CN117396417A - Device for winding yarn sets - Google Patents

Abstract

The invention relates to a device for winding yarn groups, in particular in a melt spinning process for producing synthetic yarns. The yarn groups are wound at a plurality of winding positions (1.1-1.8) to form bobbins (12) which are arranged along winding spindles (3.1) in a frame (2). Each winding position (1.1-1.8) has a traversing unit (5.1-5.8) for placing one of the threads on the bobbin (12). Each traversing unit (5.1-5.8) is associated with one of a plurality of thread guides (6.1-6.8) for separating the thread group, and the thread group is fed to the thread guides by at least one draw-off godet. According to the invention, in order to distribute and unwind the threads as uniformly as possible with as little friction as possible, the thread guides (6.1-6.8) distributed between the winding positions (1.1-1.8) are formed by freely rotatable or drivable deflection rollers (14) and part of the thread guides are formed by fixedly held thread guides (15).

Description

Device for winding yarn sets

The present invention relates to a device for winding yarn groups, in particular in a melt spinning process for producing synthetic yarns, in particular according to the preamble of claim 1.

A general device for winding yarn sets is known, for example, from WO2007/085274 A1.

In melt spinning processes, filaments extruded from a polymer melt are typically extruded through a large number of spinning nozzles in parallel with one another and are taken out and guided as a set of filaments by a godet system. In a godet system, the threads are guided parallel to one another as thread groups with a small thread spacing. Thus, the spacing between wires in the range of 4 to 6 millimeters is conventional. For winding yarn groups, known devices have a plurality of winding positions for winding each individual yarn at a winding position to form a bobbin. The bobbin width results in a greater distance between the winding positions, so that the thread group must be separated in the subsequent winding position range after exiting from the draw-off godet.

WO2007/085274A1 discloses in principle two variants of a device for winding a yarn set. In a first variant, the drawing-off godet for guiding the thread group is arranged laterally next to the winding position, so that the thread group is essentially separated from the horizontal plane with a significant deflection at the thread guides arranged at the winding position and distributed over the winding position. In this case, a freely rotatable steering roller is preferably used as the guide wire mechanism.

In a second variant on which the invention is based, the draw-off godet is arranged substantially centrally with respect to the winding position, so that after leaving the draw-off godet the yarn set is unwound by the yarn guide mechanism to allow the yarn to be introduced into said winding position. In this case, a stationary wire guide is used as the wire guide, since the wire wrap is significantly smaller. The height of the draw-off godet above the winding position is generally selected such that the wire in contact with the godet only achieves a relatively small wrap. Excessively large filament windings inevitably lead to different filament tensions when winding the filament. The draw-off godet must therefore be of sufficient height in order not to produce an impermissible wrap on the godet, especially in the case of a large number of winding positions along the winding spindle. Thus, such an apparatus for winding a wire set preferably has a height-adjustable draw-off godet to allow operation at the beginning of the process.

The object of the present invention is therefore to develop a device for winding yarn groups of the type in such a way that the yarn groups are distributed and separated over a large range of winding positions in a compact arrangement and with the godet fixed.

According to the invention, this object is achieved in that the thread guide means distributed over the winding position range are formed partly by the deflection roller and partly by the fixedly held thread guide. It has been found to be advantageous that the steering roller is rotatable and in particular freely rotatable. It has been found to be advantageous that the turning rolls are driven.

Advantageous developments of the invention are defined by the features and feature combinations of the dependent claims.

A particular advantage of the invention is that the stretching of the thread groups can be achieved even with a relatively large wrap angle on the thread guiding mechanism. Thus, the winding position of the upstream yarn guide mechanism requiring a relatively pronounced deflection of the supplied yarn can be formed by a freely rotatable or driven deflection roller. In contrast, a guide wire mechanism on which relatively small wire wraps occur due to the stretching of the wire set can be formed by fixedly held guide wire members. The combination of a freely rotatable (or driven) deflecting roller as a yarn guide in the winding position with a fixedly held yarn guide therefore has the particular advantage that the draw-off yarn guide can be held above the winding position at a relatively small distance. A very compact arrangement for winding the yarn set is thus obtained.

For the godet arranged centrally with respect to the winding position, the following inventive development is provided, the stationary godet forming the central set of godets and the deflection roller forming the outer two sets of godets. The devices distributed over the outer winding position range can thus be guided with a relatively large wrap on the wire guide mechanism (in this case a deflection roller). Instead, those in the central region which are much smaller in wrap are guided in the guide wire mechanism by stationary guide wire members. The yarn tension stress can be approximately the same in each winding position in order to wind the yarn on the bobbin.

The distribution of the deflection roller and the yarn guide over the winding position range is advantageously determined by the feed angle, which is adjusted by the yarn guidance between the yarn guide and the draw-off yarn guide roller. Thus, the permissible wrap on the guide wire mechanism can be determined, which results in no significant over-wrap friction in the respective wire.

In practice it has been found that the stationary wire guide is associated with a winding position in which the wire can be guided between the wire guide and the draw-off godet with a supply angle of more than 20 °. In this case, the feed angle is formed between the horizontal line connecting the godet mechanisms and the wire path between the respective godet mechanism and the draw-off godet roller. In this regard, the wire guide mechanism and the winding position may be clearly interrelated depending on the supply angle.

The freely rotatable or driven deflection roller is thus associated with a winding position in which the thread can be guided between the thread guide and the draw-off godet with a feed angle of less than 20 °. It has thus been found that a supply angle of less than 20 ° on the yarn guide produces an impermissible yarn friction, which leads to a different yarn tension already when winding the tube. These can be prevented by using freely rotatable or driven turning rolls.

The device for winding yarn groups according to the invention is particularly suitable for producing fully drawn yarn due to the compact arrangement of the draw-off godet. For this purpose, a development of the invention is provided in which the draw-off godet is arranged downstream of a godet group for drawing and relaxing the yarn, which godet group is held above the frame in the winding position by a godet holder, wherein the draw-off godet and godet group are oriented transversely to the winding spindle. A very short wire path with a small turn can thus be achieved, wherein the godet can be kept at a working height convenient for the user.

In this connection, it is preferred to implement the following development of the invention that the draw-off godet is held at a working height of at most 2 meters above the operating corridor.

In order to wind a large number of threads in a thread group, a development of the invention is provided in which the godet is associated with two groups of winding positions which face each other in mirror symmetry, the deflection rollers and the thread guides being equally distributed in the individual frames. Thus, for example, 24 or 32 threads can be wound simultaneously to form a bobbin.

The apparatus according to the invention for winding yarn sets, in particular in a melt spinning process for producing synthetic yarns, is explained in more detail below with reference to a number of examples and the accompanying drawings, in which:

figure 1 shows a schematic view of a first embodiment of the apparatus for winding a yarn set of the present invention,

figure 2 shows a schematic cross-sectional schematic view of the embodiment of figure 1,

figure 3 shows a schematic side view of another embodiment of the device for winding a set of wires of the present invention,

figure 4 shows a schematic side view of another embodiment of the device for winding a set of wires of the invention,

fig. 5 shows a schematic front view of the embodiment of fig. 4.

Fig. 1 shows a schematic side view of a first embodiment of the apparatus for winding a wire set of the present invention. This embodiment shows a total of eight winding positions 1.1-1.8 arranged side by side in the frame 2. The winding positions 1.1 to 1.8 extend along the winding spindle 3.1 and are held in a projecting manner on a rotatably mounted winding turret 9. In each winding position 1.1 to 1.8, a bobbin 12 is wound on the circumference of the winding spindle 3.1. The winding spindle 3.1 is driven for this purpose by a spindle drive 11.1.

For winding the thread to form the bobbin 12, each winding position 1.1 to 1.8 has a traversing unit. The traversing units 5.1 to 5.8 are arranged next to one another on the machine frame 2 and each have one or more traversing thread guides which guide the relevant thread at the winding position 1.1 to 1.8 back and forth within the width of the bobbin. The traversing units 5.1 to 5.8 are associated with a plurality of thread guiding means 6.1 to 6.8 at intervals in the upper region of the machine frame 2. The thread guide means 6.1 to 6.8 form, together with the traversing units 5.1 to 5.8 arranged below, a so-called traversing cam in which the relevant thread is guided back and forth. The thread guide means 6.1-6.8 form a thread supply to the respective winding position 1.1-1.8, respectively. The guide wire mechanisms 6.1-6.8 will be explained in more detail below.

In order to place the thread on the surface of the bobbin 12, the pinch roller 4 is associated with a traversing unit 5.1-5.8. The pinch roller 4 is mounted on the frame 2 by a movable roller carriage 22. In this case, the pinch roller 4 extends over all bobbins 12 wound on the winding spindle 3.1.

In order to wind the supplied thread as continuously as possible in winding positions 1.1 to 1.8 to form a bobbin, a second projecting winding spindle 3.2 is arranged on the winding turret 9. The winding spindle 3.2 is arranged on the winding turret 9 offset by 180 ° relative to the winding spindle 3.1. For receiving the bobbins 12, the winding spindles 3.1 and 3.2 carry winding bobbins 13 for each winding position 1.1 to 1.8. The winding spindle 3.2 is connected to a spindle drive 11.2. The winding turret 9 can be actively driven in rotation on the machine frame 2 by means of a turret drive 10 to provide winding spindles 3.1 and 3.2 for bobbin replacement. The winding spindles 3.1 and 3.2 can thus be guided alternately to the working area and the replacement area. In fig. 1, the winding spindle 3.1 is held in the working area in order to wind the supply wire of the wire group 8 to form a bobbin 12.

Winding positions 1.1-1.8 in the apparatus shown in fig. 1 are used in sequence during melt spinning to continuously wind the freshly extruded yarn groups to form bobbins. The yarn sets are guided by godets in this melt spinning process. In fig. 1, the last godet is therefore shown in front of the winding positions 1.1-1.8. The godet is in this embodiment referred to as a so-called draw-off godet 7, which guides the thread group 8 with partial wrapping around the circumference of the godet mantle. Since the threads of the thread group 8 are guided with a small thread distance from one another on the circumference of the godet 7, it is necessary for the threads of the thread group 8 to be stretched and distributed at winding positions 1.1 to 1.8. For this purpose, the thread guide means 6.1 to 6.8 are arranged immediately downstream of the draw-off godet 7, so that the threads of the thread guide group 8 are guided at different wrapping angles on the thread guide means 6.1 to 6.8, depending on the position of the thread guide means 6.1 to 6.8 relative to the draw-off godet 7. In order to allow a relatively large wrap angle to be formed on the wire guides 6.1-6.8 with a small difference in height between the wire guides 6.1-6.8 and the wire guide roller 7, the outer wire guides 6.1 and 6.2 and 6.7 and 6.8 are formed by the deflection roller 14. The central guide wire means 6.3 to 6.6 are formed by a stationary guide wire member 15. This situation is shown enlarged in fig. 2.

Thus, in the situation shown in fig. 2, the central groups of guide wire mechanisms 6.3-6.6 are each formed by a stationary guide wire member 15. The wire guides 6.1 and 6.2 and 6.7 and 6.8 each form an outer set of wire guides in the form of turning rolls 14. On each of the thread guides 6.1-6.8, the threads of the thread groups are guided with different wrapping situations, respectively. In this embodiment, the wire wrap is determined by the feed angle of the wire 8. The feed angle extends between a horizontal line formed by the yarn guides 6.1-6.8 and the yarn sheet between the respective yarn guide 6.1-6.8 and the draw-off godet 7. In this example, the supply angle is indicated as α ₁ To alpha ₈ . The threads of the thread group 8 are thus in the winding position 1.1 on the deflection roller 14 of the thread guide 6.1 at the feed angle α ₁ Is guided. The threads of the thread group 8 are thus fed at the winding position 1.2 at a feed angle α on the deflection roller 14 of the thread guide 6.2 ₂ Is guided.

As can be seen from the illustration of fig. 2, the supply angle of the central group of guide wire mechanisms 6.3-6.6, each formed by a guide wire 15, is designated as α ₃ To alpha ₆ . Supply angle alpha ₃ To alpha ₆ In terms of its value, is greater than the supply angle a in the outer groups of the thread guides 6.1 and 6.2 and 6.7 and 6.8 formed by the deflection rollers 14 ₁ And alpha ₂ And alpha ₇ And alpha ₈ . The freely rotatable or driven deflection rollers 14 in the outer winding positions 1.1, 1.2, 1.7 and 1.8 thus allow a high degree of filament winding to be achieved in the supply.

In practice, with regard to the distribution of the deflection roller 14 and the godet roller 15, it has been found that the freely rotatable or driven deflection roller 14 is associated with a winding position 1.1-1.8, at which the thread can be guided between the godet mechanisms 6.1-6.8 and the draw-off godet roller 7 with a supply angle of less than 20 °. For the distribution of the stationary thread guide 15 in the region of the winding position 1.1 to 1.8, a correlation is thus produced between the thread guide means 6.1 to 6.8 (in which the thread can be guided at a feed angle of 20 °) in the form of the thread guide 15. The distribution of the deflection roller 14 and the wire guide 15 in the winding position range 1.1-1.8 is dependent on the distance between the draw-off godet 7 and the wire guide 6.1-6.8.

In the embodiment shown in fig. 1 and 2, the guidance of the thread group 8 is performed by the draw-off godet 7 in a plane of thread movement parallel to the winding positions 1.1-1.8. For this purpose, the draw-off godet 7 is oriented parallel to the winding spindle 3.1. In principle, however, the thread groups can also be guided in a transversely oriented thread movement plane relative to the winding positions 1.1 to 1.8. In this regard, FIG. 3 illustrates one embodiment.

In the embodiment shown in fig. 3, the draw-off godet 7 is oriented transversely with respect to the winding spindle 3.1. Thus, as the yarn set stretches, a different yarn take-off point is created at the circumference of the take-off godet 7 on each yarn of the yarn set 8. The feed angles α1 to α3 on the guide wire means 6.1 to 6.8 remain unchanged as a result. In this connection, the embodiment of fig. 3 is identical to the embodiment according to fig. 2, except for the arrangement of the extraction godet 7. So to avoid repetition, reference is made to the above description.

A particular advantage of the embodiment of the apparatus according to the invention, as shown in figures 1 and 3, involves that the extraction godet 7 can be arranged at a working height accessible to the operator. The working height a is therefore illustrated in fig. 3. For operability, the extraction godet 7 can be easily arranged at a working height of up to 2 meters above the operating corridor 23. The draw-off godet 7 can advantageously be firmly mounted on the godet holder. The apparatus of the present invention is preferably adapted to wind groups of filaments to wind fully drawn filaments in a melt spinning process to form bobbins.

In this regard, fig. 4 and 5 schematically show another embodiment of the inventive device in several views. Fig. 4 shows this embodiment in a side view, and fig. 5 shows this embodiment in a front view. The following description applies to both of these figures unless one of them is explicitly mentioned.

As can be seen in the illustration of fig. 5, the yarn set 8 with the plurality of yarns is wound to form bobbins 12 and 12' by two winding positions 1.1 to 1.12 and 1.1' -1.12 '. The winding positions 1.1 to 1.12 are arranged next to one another in the first machine frame 2, and the winding positions 1.1' to 1.12' are arranged in the mirror-symmetrical second machine frame 2'. The construction of the frames 2 and 2' is identical to each other and is formed with its means only in mirror symmetry. Each frame 2,2' therefore has two winding spindles and a bobbin winding turret. The winding positions 1.1-1.12 and 1.1'-1.12' are all configured identically according to the above-described embodiment according to fig. 1 and 3, and are therefore not explained further here. The racks 2 and 2' are arranged below the frame 24. The frame 24 carries the godet holder 17, and the godet group 16 included in the godet holder is driven by the godet driving device 20. The godet set 16 is formed by a plurality of individually driven godets 16.1-16.5.

Fig. 4 shows a schematic side view of the godet set 16 and winding positions 1.1-1.12. The godet set 16 comprises, in addition to the draw godet 7, five additional draw godets 16.1 to 16.5, which are configured to be heated to draw and relax the yarn set. In the yarn path between the godet 16 and the draw godet 7, a wetting agent 18 and a turbulence device 19 are provided for respectively effecting yarn compaction of the multifilament yarn (multifilament thread) of the yarn set 8. The filaments of the filament group are then distributed in two groups over the winding positions 1.1-1.12 and winding positions 1.1'-1.12' (not shown in this example). The wire guides 6.1-6.12 and 6.1' -6.12' associated with the winding positions 1.1-1.12 and 1.1-1.12' are formed partly by the deflection roller 14 and partly by the wire guide 15.

As can be seen from the illustration of fig. 4, the outer guide wire mechanisms 6.1-6.3 and 6.10-6.12 each form two outer groups, each outer group being formed by a turning roll 14. The guide wire means 6.4-6.9 represent a central group, which is always formed by the guide wire 15. The mirror-symmetrically opposite thread guides 6.1 to 6.12' have the same distribution of the deflection rollers 14 and the thread guides 15. A U-shaped ceramic wire guide or a pigtail wire guide is preferably used as stationary wire guide 15 in this case. The freely rotatable or driven deflection roller 14 instead preferably has circumferential wire guides for deflecting the wires with the lowest possible friction level.

In the embodiments according to fig. 1 to 5, the number of winding positions and the distribution of the yarn guides with yarn guides and deflection rollers in the winding positions are exemplary. In principle, however, the thread guides can be divided into two groups according to the position of the extraction roller. Thus, in the case of an eccentrically arranged draw-off roller, the front set of wire guides may be formed by wire guides and the rear set of wire guides may be formed by deflection rollers. In this case, an important aspect is the wire extraction from the extraction godet to the winding position and the supply angle adjusted in this case.

Claims (10)

1. Device for winding a yarn set, in particular in a melt spinning process for producing synthetic yarns, with a plurality of winding positions (1.1-1.8) arranged in a frame (2) along a winding spindle (3.1), wherein each of the winding positions (1.1-1.8) has a traversing unit (5.1-5.8) for placing one of the yarns on a respective one of the bobbins, wherein each of the traversing units (5.1-5.8) is associated with one of a plurality of yarn guides (6.1-6.8) for separating the yarn set, and wherein the yarn set is fed to the yarn guides (6.1-6.8) by means of at least one draw-out yarn guide roller (7), characterized in that the yarn guides (6.1-6.8) distributed in the range of winding positions (1.1-1.8) are formed partly by a deflection roller (14) and partly by a held guide (15).

2. The apparatus according to claim 1, characterized in that with the extraction godet (7) arranged centrally with respect to the winding position (1.1-1.8), the stationary godet (15) forms a central group of the godet mechanisms (6.1-6.8) and the deflection roller (14) forms two outer groups of the godet mechanisms (6.1-6.8).

3. The apparatus according to claim 1 or 2, characterized in that the distribution of the deflection roller (14) and the wire guide (15) in the winding position (1.1-1.8) is determined by a supply angle (α) which is adjusted by wire guidance between the wire guide (6.1-6.8) and the draw-off guide roller (7).

4. A device according to claim 3, characterized in that the stationary wire guide (15) is associated with the winding position (1.1-1.8) in which the wire can be guided between the wire guide (6.1-6.8) and the draw-off godet (7) at the supply angle (α) >20 °.

5. A device according to claim 3, characterized in that the turning roll (15) is associated with the winding position (1.1-1.8) where the thread can be guided between the thread guide (6.1-6.8) and the draw-off godet (7) with a supply angle (α) <20 °.

6. The apparatus according to any one of claims 1 to 5, characterized in that the extraction godet (7) is arranged downstream of a godet set (16) for drafting and relaxing the yarn set, which godet set is held above the frame (2) of the winding position (1.1-1.8) by a godet carriage (17), wherein the extraction godet (7) and the godet set (16) are oriented transversely with respect to the winding spindle (3.1).

7. The apparatus according to claim 6, characterized in that the extraction godet (7) is held at a working height (a) of maximum 2 meters above the operating corridor (23).

8. The apparatus according to any one of claims 1 to 7, characterized in that two sets of winding positions (1.1-1.12,1.1 ' -1.12 ') are associated with the draw-off godet (7), the winding positions (1.1-1.12,1.1 ' -1.12 ') facing each other in mirror symmetry, when the deflection roller (14) and the godet (15) are equally distributed in the separate housings (2, 2 ').

9. The apparatus according to any one of claims 1 to 8, characterized in that the turning roll (14) is freely rotatable.

10. The apparatus according to any one of claims 1 to 8, characterized in that the turning roll (12) is driven.